Fundamental Concepts of ChemistryEnergy Changes in Physical Changes21Choose the best answerWhich statement about energy changes during a physical change is correct?AEnergy never changesBEnergy is always absorbedCEnergy is always releasedDEnergy may be absorbed or released Like 0 Discuss 0Share
Fundamental Concepts of ChemistryChanges of State22Choose the best answerSolid → Liquid → Gas represents which sequence of physical changes?AFreezing → BoilingBMelting → BoilingCSublimation → DepositionDMelting → Freezing Like 0 Discuss 0Share
Fundamental Concepts of ChemistryPhysical Changes23Choose the best answerA physical change is one in which:AChemical composition changesBPhysical state or another physical property may changeCNew chemical substances are always formedDChemical bonds must always be broken Like 0 Discuss 0Share
Fundamental Concepts of ChemistryClassification of Elements24Choose the best answerAmong known elements, the largest number are:AMetalsBNon-metalsCMetalloidsDNone of these Like 0 Discuss 0Share
Fundamental Concepts of ChemistryPhysical Changes25Choose the best answerSolid → Gas directly, without passing through the liquid state, is called:AMeltingBBoilingCSublimationDDeposition Like 0 Discuss 0Share